condition mean min max ZT0-3 266.6 266.6 266.6 ZT4-7 360.5 360.5 360.5 ZT8-11 234.0 234.0 234.0 ZT12-15 146.64999999999998 146.64999999999998 146.64999999999998 ZT16-19 266.8 266.8 266.8 ZT20-23 283.6 283.6 283.6